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Answer :

LCM = 2× 2× 2×3×3×2×3 = 432

432 sec = 7 min 12 sec

Hence, lights will change together after every 432 seconds

- Q.1. Renu purchases two bags of fertiliser of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertiliser exact number of times.
- Q.2 Three boys.step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. What is the minimum distance each should cover so that all can cover the distance in complete steps?
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